Marx Brothers - At The Circus (1939) by Edward Buzzell

and starring Kenny Baker, Florence Rice, Eve Arden, Margaret Dumont, Nat Pendleton.
At the Circus is a 1939 Marx Brothers comedy film in which they save a circus from bankruptcy. It is notable for Groucho Marx's classic rendition of "Lydia the Tattooed Lady." and co-stars include Margaret Dumont, Eve Arden, and Kenny Baker. Plot : The circus strong man (Nat Pendleton, one of the ringer football players in Horse Feathers), and the midget (Jerry Marenghi, who also appeared in a few Our Gang shorts), are accomplices of the bad guy Carter (James Burke) who is trying to take over the circus. In the animal car, they knock Baker out and steal his $10,000. Groucho, as lawyer J. Cheever Loophole, arrives to handle the situation.